Improvement in cotton-gin ribs



J. ROBISON.

Improvement in Cotton-Gin Ribs.

4IFatented Oct. 15,1872

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UNrTED STATES PATENT OFFICE.

JOSEPH ROBIsON, OE ALBANY, NEW YORK.

IMPROVEMENT IN COTTON-GIN RIBS.

Specification forming part of Letters Patent No. 132,217, dated October15, 1872 clare that the following is a description theref of, referencebeing had to the accompanying drawin g forming a part of thisspecification, in

Figure l represents a perspective view of a Y rib of a cotton-ginembodying my invention;

Fig. 2 is a face view of a section of the same;

'f Fig. 3 is a longitudinal sectional view of the same; and Fig. 4 is across-sectional view taken at line No. l in Fig. 3.

My invention relates to the combination of I a detachable piece of metalwith the rib of a cotton-gin at the point of wear on the said rib,whereby the said rib may be retained in use in an 'individual machinefor the period of the existence of the machine, and the worn portion bedetached and replaced by a new piece in a ready and inexpensive manner.

In the drawing, A represents a rib of a cotton-gin made in the usualform, and used between the saws. a is the face of the said rib, whichface (when the rib is placed in position between the saws) will bepresented to the cotton, and by use a portion of the rib between thepoints :c a: (on the face) becomes worn by the action ofthe cotton,seeds, and dirt, abrading the rib at that point, so that in time theribs must be removed and replaced by new ones. In the face a of the ribA, and between the points cc, (the place of wear,) I set in thedetachable piece B, which piece may be of hardened steel or chillediron. The said detachable piece is so arranged that its face will beflush and even with the face ofthe rib, and is held in place bydovetails, as shown in Figs. 1, 2, and 3. b is an impinging-sorew,entering the rib A from its back, into which it screws,

and the point of the said screw is made to impnge on the back oftheplate B, which would render the said detachable piece secure with therib and give easy facility for the removal or replacement ofthe pieceswhen desired.

I am aware that hardened metal detachable pieces have been used in thesaid ribs at the point of its wear by the cotton and grit therein; butsuch detachable pieces were placed in their recesses from the face side,and were secured therein by a screw workin g from the face of the saiddetachable plate into the rib, and thus secured its attachment hasalways depended wholly on the screw, and the head of the screw, if notof steel, would soon wear away; and whether of steel or iron, the saidhead would be liable to catch the cotton, and was thereby apt to beworked loose. By my improved method of securing the said piece the saidpiece is lirmly held in place without any possibility of becomingloosened by the action of the cotton, and the face of the said piecewill not present any obstacle for catching the cotton.

It is therefore seen that by the improvements in my. invention theoriginal ribs of a cotton-gin can be used as long as the machine exists,and the labor and expense attending the replacing of the worn ribs bynew ones, as heretofore required in cotton-gins, will be obviated. Thedetachable piece, receiving all wear, can at any time be removed andreplaced at but a triie of' cost. Y

What I claim, and desire to secure by Letters Patent, is-

The combination of the detachable piece B, made with the dovetailedholding edges, in

combination with the rib A provided with the dovetail recess andset-screw b,when all are arranged and constructed substantially as andfor the purpose set forth.

JOSEPH ROBISON.

Witnesses:

ALEX. SELKIEK, OHAs. SELKIRK..

